package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /*
     * 添加购物车
     * */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前商品在购物车中是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果已经存在，则将数量加一
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }else{
            //如果不存在，则需要插入一条新数据
            Long dishId = shoppingCart.getDishId();
            if(dishId != null){
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //本次添加的是套餐
                Long setmealId = shoppingCart.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);




        }


    }
    /*
     * 查看购物车
     * */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /*
     * 清空购物车
     * */
    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    /*
     * 删除一个商品
     * */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        Long userId = BaseContext.getCurrentId();
        Long dishId = shoppingCartDTO.getDishId();
        Long setmealId = shoppingCartDTO.getSetmealId();
        String dishFlavor = shoppingCartDTO.getDishFlavor();
        List<ShoppingCart> list = new ArrayList<>();
        if(dishId != null){
            ShoppingCart shoppingCart = ShoppingCart.builder()
                    .userId(userId)
                    .dishId(dishId)
                    .dishFlavor(dishFlavor)
                    .build();
            list = shoppingCartMapper.list(shoppingCart);
        }else{
            ShoppingCart shoppingCart = ShoppingCart.builder()
                    .userId(userId)
                    .setmealId(setmealId)
                    .build();
            list = shoppingCartMapper.list(shoppingCart);
        }
        ShoppingCart shoppingCart = list.get(0);
        if(shoppingCart.getNumber() == 1){
            shoppingCartMapper.delete(shoppingCart);
        }else {
            shoppingCart.setNumber(shoppingCart.getNumber() - 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }
    }
}
